[Dioxin-l] Nature and halogens

[david bell]

Err, what's a "natural dioxins" agenda ?

The amount of dioxin which is naturally produced strikes me as an 
interesting and important issue; it certainly seemed important to the EPA, 
'cos they have spend hundreds of thousands trying to establish what 
background levels of dioxin are.

One of the issues that arises are the consequences of setting a regulatory 
limit at levels below what nature produces. Continuously cleaning up natural 
production of dioxin might be painful, if not impossible.

just out of interest, it turns out that some organisms naturally synthesise 
dioxins (not chlorinated). I append the reference for your info.

david

>as ws just mentioned by david bell in another thread on the list, it is not
>in dispute that PCDD/F etc levels skyrocketed in the industrial age; I'd
>add, to levelsfar above what is known and not known to be safe.  This is
>obvious to most, and so anyone who pursues a "natural dioxins" agenda has
>to have their motives seriously questioned--ie there's little logical pint
>in discussing the subject.


TI:  Aplidioxins A and B, two new dibenzo-p-dioxins from the ascidian 
Aplidiopsis ocellata
AU:  Wolf_D, Schmitz_FJ, Hossain_MB, vanderHelm_D
NA:  UNIV OKLAHOMA,DEPT CHEM & BIOCHEM,NORMAN,OK,73019
JN:  JOURNAL OF NATURAL PRODUCTS, 1999, Vol.62, No.1, pp.167-169
IS:  0163-3864
DT:  Article
AB:  Two new substituted dibenzo-p-dioxins, aplidioxins A (1) and B (2), 
were isolated from the ascidian Aplidiopsis ocellata. The structures of 
these compounds were elucidated by a combination of 1D and 2D NMR 
spectroscopy and an X-ray analysis of aplidioxin A.


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